PHP isset() & empty() are really useful!
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PHP radio buttons explained
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PHP $_GET and $_POST explained
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Apprendre PHP (5/19) - Traitement de formulaires en PHP
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PHP string functions are awesome
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APPRENDRE À CODER EN PHP -ISSET ET EMPTY
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PHP doesn't suck (anymore)
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PHP Tips and Tricks: 10 Ways to Level Up Your Code Game
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